As part of the Bruins’ 90 years of hockey celebrations, the organization will be honoring the B’s of the 1970s on Thursday night.

With the Blues coming to town, Bobby Orr will be dropping the ceremonial first puck to kick off the night’s tribute. Of course, the Bruins legend scored the game-winning goal in overtime against St. Louis, leading the B’s to their first Stanley Cup in 29 years in iconic, leaping fashion.

Although somewhat impossible to imagine the game ending any other way, former coach Harry Sinden and former player Phil Esposito look back at that game, recall their approach to overtime and remember that they didn’t believe their best defensive unit would also become their best offensive unit for a shift.

Check out the above video to hear more about No. 4’s Cup-clinching goal.